The Jamaican National Numbering Plan is based on the North American Numbering Plan (NANP) which is the basic numbering scheme for the Public Switched Telephone Network for the North American Numbering Plan Area. The twenty (20) constituent countries of the NANP Area (which share the International Country Code 1) share the NANP numbering resources cooperatively. The North American Numbering Plan Administration (NANPA), an agency of the United States Federal Communication Commission (FCC), holds overall responsibility for the neutral administration of the NANP, subject to directives from regulatory authorities in the participating countries.